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part2.c
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part2.c
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#include <stdio.h>
// ! I really need to stop running part1.c accidentally and wasting time
// solution time: 03:22.57 (mm:ss.ms)
int main() {
// read input.in
FILE *fp = fopen("input.in", "r");
// read input
int matrix[1000][1000] = {0};
int lit = 0;
char str[100];
// ! Had issues with selecting the whole line with fscanf with %s
while (fscanf(fp, "%99[^\n]\n", str) != EOF) {
int x1, y1, x2, y2;
// printf("%s\nSelected: %c\n\n", str, str[6]);
if (str[6] == 'n') {
sscanf(str, "turn on %d,%d through %d,%d", &x1, &y1, &x2, &y2);
} else if (str[6] == 'f') {
sscanf(str, "turn off %d,%d through %d,%d", &x1, &y1, &x2, &y2);
} else {
sscanf(str, "toggle %d,%d through %d,%d", &x1, &y1, &x2, &y2);
}
// Turn on, off, or toggle the lights
for (int i = x1; i <= x2; i++) {
for (int j = y1; j <= y2; j++) {
if (str[6] == 'n') {
matrix[i][j] += 1;
} else if (str[6] == 'f') {
if (matrix[i][j] > 0)
matrix[i][j] -= 1;
} else {
matrix[i][j] += 2;
}
}
}
}
// close input.in
fclose(fp);
// count the number of lit lights
for (int i = 0; i < 1000; i++) {
for (int j = 0; j < 1000; j++)
lit += matrix[i][j];
}
// print answer
printf("%d\n", lit);
return 0;
}